Wristwatch



FIG. 1 is a front view of a wristwatch showing my design;

FIG. 2 is a front perspective view of the wristwatch; and,

FIG. 3 is a right side view thereof.

The broken lines in the drawings are used to show portions of the wristwatch that do not form part of the claimed design. 

CLAIM The ornamental design for a wristwatch, as shown and described. 